NO, it does not make sence since cytomel is an active t3. T4 converts to T3. So if you are taking t3 in the form of Cytomel it makes no sence to supplement with T4. Stack your T3 with Clenbuterol of eca.
The T3 is the the moch more powerfull of the two. As for the dosage look over some old posts. Has been discussed many times. There are many varying theories as to the proper dosage and cycling. Mine personall way of using the med is take a small dosage like 20mcg per day for 6 weeks with ECA and good diet and training. Works well for me. Others cycle by pyramiding up to 100mcg per day then back down. I would advocate experimenting with lower dosages first. Granted it wont work as fast but it will give you a chance to learn about your body.